/Engine/Source/Runtime/InstallBundleManager/Public/InstallBundleManagerInterface.h
EInstallBundleResult FlushCache ( FInstallBundleSourceOrCache SourceOrCache, FInstallBundleManagerFlushCacheCompleteDelegate Callback, [ELogVerbosity::Type](API\Runtime\Core\Logging\ELogVerbosity__Type) LogVerbosityOverride )